1. Department of Otorhinolaryngology/Head and Neck Surgery; University Medical Center Groningen; University of Groningen; Groningen The Netherlands
2. Graduate School of Medical Sciences (Damage and Repair in Cancer Development and Cancer Treatment); University of Groningen; Groningen The Netherlands
3. Department of Research; Netherlands Comprehensive Cancer Organization (IKNL); Utrecht The Netherlands
4. Department of Health Technology and Services Research; MIRA Institute for Technical Medicine and Biomedical Technology; University of Twente; Enschede The Netherlands
5. Department of Radiation Oncology; University Medical Center Groningen; University of Groningen; Groningen The Netherlands
6. Department of Epidemiology; University Medical Center Groningen; University of Groningen; Groningen The Netherlands